Wireless signaling



R. A. HEISING.

WIRELESS SIGNALING.

APPLICATION 'FILED OCT. 26, 191's.

Patent ed Feb. 14, 1922.

,AAOQESST nii'iz'inonn A. nnrsine. or EAST ORANGE. NEW JERSEY, AssmNoR r WESTERN ELEGTREC COMPANY, INCORPORATEI',

on NEW YoRK'.

OF NEW YQRK, N. Y., A CORORATION WIRELESS SIGNALING.

Specification of Letters Patent. P w -ma F b 14 1922 Application filed October 26. 1916. Serial 3%. 127,922.

()i'iher l'cutnrcs of the invention relate to ccrtuiu combinations and arrangements of parts hereinafter dc-scribwl and particularly pointed out in the claims. ihe advantages of which will e apparent. to those skilled in the art.

'recoiro signals.

' system at the same station. it is convenient.

to have som means for len'iporuriiv shunting or disconnecting the receiving; upparati'is. For economical working. the oscillating systen'i used as the source ol' high-frequency oscillations should oporntc only when signals are desired to be lrnnsmiti'cd. so lhat the oscillator shell be oscillating only when 'lhe antenna is connected to the tranruniltiug system. and shall be inoperative when the antenna is rcccivin; signals i'rom an outside Source. The purpose ol' this invention is to ali ord a ready means whereby these ends may be realized.

For the accomplishmcnt oi" the above purpose. this invcnlion embodies a key or pushhutton thal opcinies three relays. controlling the lhrce 'leutures above mentioned. The im-ention shown in connection with a wireless telephone station. the principal features oi which are covered in the United States patent to van der Bill. No. L EWJSZ, patented Aug. 24. 1920 l lartloy, No. 1,356,763,

patented October 26, 1920, and Colpitts and Arnold, No. 1.388350, patented August 23. um.

This invention may be better understood by relerence to the fiiillowing specification I and :ucoinpanying drawing in which the figure represents one embodiment-of this invention. 7

The signaling set, consisting of a trans nutter 1, and a receiver is shown connect ed to a transmitting system 3 and system 4. the antenna 5 being); adapted to be connected to the one or the other. The transmitting system consists of an oscillation generator. a n1odulatin; device, and amplifying means. .'lhe oscillation generator'comprises a vacuum tulle (S and an 05* cillat'ino circuit containing the inductance 11 and capacity 1 connected to. the input; and output electrodes of the tube. Such a generator is of the type dcseribed in thel'lartley patent previously mentioni-ul. The modulating device 7 is preferably of the audion type on whose input terminals are impressed both the signal wave oscillations by means of transformer 8 from the transmitter 1 and carrier wave oscillations from the oscillation generator by means of ransoutput circuit of tho amplifying system may' be inductively connected to the antenna 5 by means of a transformer 13.

The receiving system 4 inductively related to the antenna 5 by means of a repeating coil 17; The received carrier \RVBS are detected by the detector 18. which is preferably of the audion type. Thelletected signals are impressed on the receiver .2 by means of a repeating coil 19. These signals may, however, be amplified to any desired degree in tho-usual manner, before being impressed on the receiver 2.

Associated with the signaling set is a key a recei ving' 22 and two key contacts and 24. In circuits with contact Mare a source of current, 25) and three relays, 25, :26 and 27. The first of these circuits may l e traced from negative pole of battery .29, by way of relay 2?, relay 26. contact 24, to the positive pole of battery 2%), thus connecting relays 26 and 27 in series. The second circuit may be traced from negative pole of battery 29, relay 25', contact 24, to positive pole of battery 29. For convenience, these two circuits have been traced in the reverse direction from the negative pole to the positive pole of battery. In close proximity to relay 25 is a switch l4, which normally is in contact with terminal 20, thereby serving to connect the antenna to the receiving system 4. Adjacent to relay 26 is a switch 16 which is normally closed. thereby shoitcircuiting a part of inductance 11 and connecting the grid of tube 6 directly to the cathode, so that the highfrequency oscillations from the oscillator (i are suppressed. Near relay 27 is a switch 15 which is normally open, thus allowing the received signals to pass on to the detector 18, instead of being shunted. The switches 14.15 and 16 will in gene al constitute the armatures of the relays 25, 2G and 27. Consequently, withthe three switches or arinatures in their normal positions. the apparatus is temporarily adapted for the reception of signals.

If it is now desired to disconnect the receiving system and connect the antenna to the transmitting system, it will be necessary to start the oscillator 6 and shunt the receiving system to eliminate the side-tone. These objects are attained by the use ofley 22 and the three relays, for when the 'rey 22' is 1 pressed down, so as to make an eleci rical connection between the contacts 22-3 and 24, thecircuit containing the relays and the battery 29 is closed so that the relays become energized. Switch 14 is then pulled over to contact 21, thereby connecting the transmitting system to the antenna; the switch 16 is opened, thereby breaking the shunt. around part of inductance 11, thus allowing the oscillator to oscillate and to impress its oscillations on the-input circuit ofthe modulator by means of the inductive relation between the primary and secondary of coil. 9: an-l the switch 15 is pulled over to contact 28,

7 thereby shunting the detector 18 so that no energy will go. through to the're'ceiver 2: In actual practice it s sometimes desirable .not to completely eliminate the; side-tone but to allow a portion of the energy oftlie transmitted sig ialsto'pass through thedetector 18 to the i eceivel', so the I X the operator will know whenthe tr nsmitting apparatus is working satis actorily. If there is no resist-', ance' between points 31 andatiQ, there will be silence in the receiver. But there will be a desired small side-tone etfecttif a resistance 30 which may be variable isadded to the closed, which prevents any energy being fed,

back into the receiving system.

The key 22 may be of any suitable form for making and breaking the circuit. Devices 25, 2(5 and 27. while preferably of the relay t vpc inay be of any suitable form for the magnetic control of the switches.

While the features of this invention have been described and illustrated in connection with a radio signalling system. it is to be \H'KltlStOOtl that the invention is not so liniited but is equally applicable to systems in which the signal waves are guided by Wires or other conductors.

What is claimed is:

1. In a telephone system. the combination of a transmitting device, a receiving device, a key, and a high frequency circuit, said transmitting device including an oscillator, said keyhaving associated therewith means for connecting said transmitting device and said receivingdevice to said high frequency circuit, means for regulating the side tone in the receiving device, and means for controlling the starting of said oscillator.

2. In a signaling system, a transmitting apparatus, a receiving apparatus, an antenna. and a manually operated key, said transmitting key for simultaneously changing the connections of said transmitting apparatus and said receiving apparatus to said antenna, starting said oscillator, and eontrollingthe side tone in said receiving apparatus.

3. In a telephone system, a transmitting apparatus comprising a generator of high frequency oscillations. a receiving apparatus including a receiver, a transmitting conductorassociated with said transmitting apparatus and said receiving apparatus, and means to simultaneously render said ator operative, connect said geiiei'atortosaid transmitting conductor, and to, limi to a desired value the-side tone in said reesliver'.

4. In a signaling system, a generator-0f oscillations, means including transmitter for controlling the amplitude of the oscillations transmitted from said generator, means to prevent said generator from producing oscillations, ductor, said preventing means inoperativegmpect gener= apparatus including an oscil- -la.tor. and means under the control of said a telephone a transmittingwc on and means to simultaneously wander said generator to said transmitting conductor, and close a talking battery circuit through said telephone transmitter.

5. In a signaling system, an antenna, a re ceiver normally connected thereto, and a transmitter, .means to disconnect said receiver from and to connect said transmitter to saidantcnna. and means to regulate the intensity of the side tone in said receiver.

(1. In a signaling system, an antenna, a receiver normally connected thereto, and atransmitter. means to disconnect said receiver from and to connect said transmitter to said antenna. and meansto regulate the intensity of the side tone in said receiver, said last named means comprising a variable impedance in shunt to said receiver.

7. in a signaling system having a transmitting apparatus, a ,receiving apparatus and an antenna, said transmitting apparatus including an oscillator, the combination w th a transmitting and a receiving instrument of three relays and means for controlling the action of said relays,--one relay affording a means for controlling the connections of one of said apparatus to the antenna, thereby disconnecting the other apparatus, a second relay serving to control side-tone in the receiving apparatus when the transmitting appa'ratus 1s being operated, and a third relay controlling the operation of said oscillator.

7 R. In a signaling system, a transmitting apparatus including an oscillator, a receiving apparatus, an antenna cooperating with both apparatus, a relay for connecting the antenna to one appa 'atns and disconnecting it from the other apparatus, a relay for regulating the side tone of the transmitting .ap

pa ratus in the receiving apparatus, a relay controlling the oscillator, and a key controlling the relays.

9. In a signaling system, a transmitting.

apparatus, a receiving apparatus, a signaling set and an antenna, said transmitting apparatus having an oscillator, said signaling set consisting of a transmitter, a receiver and a key, a source of current for said transmitter, the combination of three relays, said key serving as a means for controlling said source of current and operating said r *lays,'one-relay serving as a means for con ecting said antenna to one of said apparatus and. disc0nnecting it from the otherv apparatus, the second relay serving to control the side-tone in said receiving apparatus when the transmit ting apparatus is being .operated,'and the third relay controlling the operation of the oscillator. 1 i

In witness whereof, I hereunto subscribe my name this 25th day of October, A. D.,

RAYMOND A; HEISING. 

